Editing Radio Data System (section)

==== Group type 4 – Version A – Clock time and date ====
{| class="wikitable"
|-
|Version
| colspan="2" |Block 1: 26 bits
| colspan="9" |Block 2: 26 bits
| colspan="2" |Block 3: 26 bits
| colspan="2" |Block 4: 26 bits
|-
|Block Internal
|PI Code
|Check + Offset A
|GTYPE
|B0
|TP
|PTY
|R
|R
|R
|Time/Date Data
|Check + Offset B
|Time/Date Data
|Check + Offset C'
|Time/Date Data
|Check + Offset D
|-
|Bit Value
|16 bits
|
|0100
|0
|X
|XXXXX
|
|
|
|2 bits
|
|16 bits
|
|16 bits
|
|}
When group type 4A is used, it shall be transmitted every minute according to EN 50067.

The clock time group is inserted so that the minute edge will occur within ±0.1 seconds of the end of the clock time group.

Time and date are packed as these:
{| class="wikitable"
|Time/Date Data
| colspan="8" |Half Block 2 Payload
| colspan="16" |Block 3 Payload
| colspan="16" |Block 4 Payload
|-
|Payload Bit Pos
|7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|15 ||14 ||13 ||12 ||11 ||10 ||9 ||8 ||7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|15 ||14 ||13 ||12 ||11 ||10 ||9 ||8 ||7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|-
|Field Bit Pos
| colspan="3" rowspan="2" |etc...
| colspan="3" |Reserved
|16 ||15 ||14 ||13 ||12 ||11 ||10 ||9 ||8 ||7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|4 ||3 ||2 ||1 ||0
|5 ||4 ||3 ||2 ||1 ||0
|± ||4 ||3 ||2 ||1 ||0
|-
|Description
| colspan="3" |Reserved
| colspan="17"|[[Modified Julian Day]] Number
| colspan="5" |UTC Hours (0–23)
| colspan="6" |UTC Minutes (0–59)
| colspan="6" |Local Time Offset
|}
Note: The local time offset is expressed in '''''multiples of half hours''''' within the range −15.5h to +15.5h. It is expressed in [[Signed magnitude#Signed magnitude representation|signed magnitude]] form, with the most significant bit being the "Local Offset [[Sign bit|Sign" bit]] (LOS), 0 = + (east of [[Greenwich mean time|Greenwich]]), 1 = −.